Alarm device on windows.



C. W. ERVIN.

ALARM DEVICE 0N WINDOWS. APPLICATION FILED JUNE 30. 1914.

1,147,795. Patented July 27, 1915.

4- EIE. L-/6 CHARLES W. ERVIN, or Los Anennns, CALIFORNIA.

ALARM DEVICE ON WINDOWS.

Specification of Letters Patent.

Patented July av, 1915.

Application filed June 30, 1914 Serial No. 848,215.

To all whom it may concern Be it known that I, CHARLES W. ERvIN, a

citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Alarm Devices on Windows, of which the following is a specification.

This invention relates to improvements in alarm devices inserted into the screen sash, in which a groove may be cut to give room for a buzzer, battery, and connecting wires.

The invention consists of the parts and the combination of parts as hereafter more fully described and claimed, having reference to the accompanying drawing, in which Figure l is a screen sash, showing the grooves for my alarm devices, with the cover plate taken away. Fig. 2 is a horizontal sectional view of the screen sash. Fig. 3 is the front view of a straight spring, used as contact. Fig. 4 is the side view of the straight spring showing the insulated connection for the cross wires. Fig. 5 is the front view of a bent spring, used as contact. Fig. 6 is the side view of the bent spring. Fig. 7 is the side view of a lever contact. Fig. 8 is the front view of the lever contact.

In accordance with my invention, my alarm device is inserted into grooves 1, out into the sash 2, as shown in Fig. 1 on the drawing. In one corner is shown a small buzzer 3, also inserted, which may be directly connected to a small battery 4. One wire 5 is shown as running on one side of the grooves 1, and another wire 6 running on the opposite side, leaving room between, for contacts. These contacts may be made of sheet metal as shown in Figs. 3, 4, 5, 6, 7 and 8. Two opposite contacts are connected by cross wires 7. In Figs. 3 and 4, the contact 8 should be made straight to serve as a spring against the contact 9 shown in Figs. 5 and 6, which is bent, spring contact 8 being stronger than spring contact 9. The reason therefor will be given later on. A turning contact 10, see Fig. 1, may be provided at a suitable place between the wires 5 and 6. The lower edge 13 of this contact 10 will touch the wire 5 while the upper edge 12 will close the circuit on the wire 6, whenever the contact 10 is turned by the lever 11. The wire 6 is connected to the buzzer 3 with one end, as indicated at 14, while the other end is disconnected. The

wire 5 is shown on the drawing as being connected to the battery 4 at one end, as indicated at 16, while the other-end remains disconnected. Instead of using the battery, it will easily be understood that the two points 15 and 16 may also be connected to other current supply, which may already be 1n use in the building. The cross wires 7,

mentioned heretofore are hidden behind the screen wire 17 as shown in Fig. 2. The grooves 1 are closed by a cover plate 18, see Fig. 2. Insulation 19, see Figs. 4 and 6, may be provided to make the cross wires 7 nonconductors.

This screen sash will give an alarm in the following way: Supposing the screen sash is in its proper position in a window frame, then, the lever 11 of the turning contact 10 will be in the position as shown in Fig. 1. As soon as the screen sash is shifted in either direction, the lever 11 resting against the window frame, spring-like, will turn over and bring the edges 12 and 13 in contact with the wires 5 and 6, thus closing the circuit and giving alarm. Should the screen be pressed upon, the cross wires, or at least one cross wire will be pulled enough to bend the spring contact 8 over to the wire 5, thus closing the circuit, and also: if one of the cross wires is cut through together with the screen wires, not being visible from the outside of the window, the spring contact 9 will be released and move over to the wire 6, thus making a circuit. As said in the beginning, two opposite spring contacts 8 and 9 are always connected by a cross wire 7, contact 8 being straight, and contact 9 being bent, but held straight or back from the connecting wire 6 by the stronger contact 8 through the cross wire 7 so, whenever a cross wire is cut, it will also release the bent spring contact 9 to move into connection with the wire 6.

Having thus described my invention, I claim 1. In an alarm device for windows, a win dow screen provided with a groove in the frame thereof and alarm mechanism concealed in said groove.

2. In an alarm device for windows, the combination of a window screen provided with a groove in the frame thereof, a battery, alarm mechanism and contacts in said groove and wires crossing said frame for operating said contacts to operate the alarm, all substantially as set forth.

3. In an alarm device for Windows, the the circuit of said connections to said alarm, 10 combination of a Window screen provided all substantially as set forth. with a groove in the frame thereof, cross In testimony whereof I hereunto affix my Wires hidden behind the screen, an alarm, signature in the presence of tWo Witnesses.

battery and Wire connections inserted in the said groove, contacts connected to and oper-- CHARLES ERVIN' ated by said cross Wires for closing the cir- Witnesses:

cuit alarm, and a lever operated by shifting Lnsnm H. WHITE,

the sash in either direction for also closing H. L. FoWLnR.

Copies of this patent may be obtained for five cents each,by addressing the Commissioner of Patents.

Washington, D. G. Y 

